When I shutdown FF the FF window disappears, but a new FF cannot be started unless I manually end FF from Task Manager. When running I cannot "open Link in a new window" - nothing happens, but opening a link in a new tab works. I am running FF3.6.13 on Windows XT. I ran antivirus software, so I don't think I'm infected. All other programs work fine. I deleted and reinstalled FF. I deleted FF and installed an older version. No luck.